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Getting assertion failures:

[ 9925.287975] WARNING: CPU: 3 PID: 7538 at /build/buildd/linux-3.19.0/drivers/gpu/drm/i915/intel_display.c:1256 assert_plane.constprop.87+0x7b/0x90 [i
915]()
[ 9925.287976] plane A assertion failure (expected on, current off)

Around the same time, WiFi connections drop. I cannot prove the two
problems are related, but I don't have WiFi issues on other devices.

alex@nuc1-hkg:~$ lsb_release -rd
Description:	Ubuntu 15.04
Release:	15.04

alex@nuc1-hkg:~$ apt-cache policy xserver-xorg-video-intel
xserver-xorg-video-intel:
  Installed: 2:2.99.917-1~exp1ubuntu2.2
  Candidate: 2:2.99.917-1~exp1ubuntu2.2
  Version table:
 *** 2:2.99.917-1~exp1ubuntu2.2 0
        500 http://tw.archive.ubuntu.com/ubuntu/ vivid-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     2:2.99.917-1~exp1ubuntu2build1 0
        500 http://tw.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages

alex@nuc1-hkg:~$ apt-cache policy linux-image-generic 
linux-image-generic:
  Installed: 3.19.0.21.20
  Candidate: 3.19.0.21.20
  Version table:
 *** 3.19.0.21.20 0
        500 http://tw.archive.ubuntu.com/ubuntu/ vivid-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ vivid-security/main amd64 Packages
        100 /var/lib/dpkg/status
     3.19.0.15.14 0
        500 http://tw.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.2
ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8
Uname: Linux 3.19.0-21-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Tue Jun 16 14:33:41 2015
DistUpgraded: Fresh install
DistroCodename: vivid
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation Broadwell-U Integrated Graphics [8086:1626] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Intel Corporation Device [8086:2057]
InstallationDate: Installed on 2015-06-16 (0 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-21-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-video-intel
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/29/2015
dmi.bios.vendor: Intel Corporation
dmi.bios.version: RYBDWi35.86A.0249.2015.0529.1640
dmi.board.name: NUC5i5RYB
dmi.board.vendor: Intel Corporation
dmi.board.version: H40999-503
dmi.chassis.type: 3
dmi.modalias: dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0249.2015.0529.1640:bd05/29/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.60-2
version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
xserver.bootTime: Tue Jun 16 14:32:31 2015
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                               10103 
 vendor                                     AOC
xserver.version: 2:1.17.1-0ubuntu3

** Affects: xserver-xorg-video-intel
     Importance: Unknown
         Status: Unknown

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug bios-outdated-0350 ubuntu vivid
-- 
plane A assertion failure (expected on, current off) on Intel NUC 5i5RYH
https://bugs.launchpad.net/bugs/1465506
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